Page 405 - Cam Design Handbook

THB12 9/19/03 7:34 PM Page 393

CAM SYSTEM DYNAMICS—ANALYSIS 393

(b) Horizontal.

(a) Vertical.
FIGURE 12.27. 8-degree-of-freedom translational subsystem models.

F F F F cos 2 a F
d = p = p + p + p + p
rs
k k k k k
t rs rb h vs
and
1 kk k + k k k + k kk cos a + k kk
2
= rb h vs rs h vs rs rb vs rs rb h .
k kk k k
t rs rb h vs
Then
F = d k
p rs t
kk k k d
= rs rb h vs rs .
kk k + k k k + k kk cos 2 a + k kk
rs rb vs
rs h vs
rs rb h
rb h vs
The normal contact force F n is obtained according to the criterion of separation of
contact between the cam and roller,
F
y y +
y £+ p .
2 1
k
h
F p
For y <+ 1 , contact is maintained, thus
y y +
2
k
h